Method of treating mercerizing solution



Jan. E4, 1930. w. H. EGGERT ,743,122

METHOD OF TREATING MERCERIZING SOLUTION Filed 0G12. l2, 1927 2 Sheets-Sheet l E j VU: mi 1 70 IIl M f WH i i? if 1|h f/ /A/ I if T N 75 75 1 53 1 {ifi/Z4 H/ x y 5.5 j M il G k A/ *aven-307; 4 5?, f5 mwgwf ,by @Ma Jan. m, 1930. w. H. EGGERT 1,743,122

METHOD OF TREATING MERCERIZING SOLUTION Filed 0G12. l2. 1927 2 Sheets-Sheet 2 Patented Jan. 14, leso 1,743,122

'WILLIAM H. EGGERT, OF BUFFALO, NEW YORK, ASSIGNOR TO ZAREMBA COMPANY, F BUFFALO, NEW YORK, A CORPORATION OF MAINE METHOD OF TREATING MERCERIZING SOLUTION Application ledrctober 12, 1927. Serial No. 225,664.

This invention relates to an apparatus for the mercerizing box and the filter, respecand process of treating the solution used in tively. mercerizing cotton yarn or cloth. Connecting the bottom of the mercerizing At the present time cotton yarn or cloth is box with the top of the filter tank 14 is a pipe mercerized by immersing it in a strong solu- 15 for the passage of the solution, the flow 55 tion of caustic soda, the yarn or cloth being from the box to the filter being manually conunder tension during the treatment. This trolled by the valve 16 or automatically conmaterial in passing through the treating sotrolled by a float-actuated valve 17 of any lution of caustic soda gradually contaminates suitable and well known construction, that it with lint, gums, oils and dust particles. shown in the drawings consisting of aoat 18 50 The yarn or cloth also heats the caustic -soda guided in the cover 19 of the filter tank and solution, which must be maintained at a low connected to the stem of the valve plug 20 by temperature. The foreign substances left in a vertically swinging-arm 21. In the filter the solution are harmful to the mercerizing tank is a bed of sand 22 or other appropriate 15 process and goods of the highest quality canfiltering medium which intercepts the lint, e5 not be produced unless the bath of caustic dust and other foreign particles present in the soda solution is withdrawn from the mercercaustic soda solution. izing machine before the contamination be- After being filtered the solution is delivcomes too great. However, this changing of ered to the cooling device 13 through a pipe 23 2o the solution reduces production and causes in which is interposed a suitable pump 24. 70 loss of caustic soda. This cooling device preferably consists ofl a The principal object of my invention is to tank 25 to the bottom of which is connected a overcome the disadvantages above stated by pipe 26 for the discharge of the treated solucontinuously drawing part of the caustic soda tion by gravity into the mercerizing bOX,

25 solution from the mercerizing machine, puri- While the pipe 23 discharges into the upper 75 fying it by filtration, cooling the solution to end of said tank. The latter contains a coil the required temperature, and thence return- 27 for the circulation of a cooling uid such ing it to the mercerizing machine for re-use. as Water or the brine from a refrigerating ma- Another object is the provision of a simple chine, and extending centrally through this 3o' reliable and efficient apparatus for carrying coil is a suitable agitator 28 driven by an elec- 80 out my improved process. tric motor 29 for maintaining a rapid and In the accompanying drawings constant circulation of the caustic solution Figure 1 is a front View of the apparatus around the cooling coil. Valves 30 and 31 in embodying my invention. Figure 2 is a vertithe pipes 23 and 26, respectively serve to concal section of the cooling unit of the apparatrol the How of the caustic solution from the e5 tus. Figure 3 is a similar section of the filterfilter to the cooler and from the latter into the ing unit. Figure 4 is an enlarged fragmen mercerizing box 10.` tary cross section on line 4 4, Figure 3. Connecting the pipe 15 with the pipe 23 Similar characters of reference indicate by T-fittings 32 and 33, respectively, is a corresponding parts throughout the several branch pipe 34 to which is joined a wash 90 views. water inlet pipe 35 by which the filter may be In the preferred construction of the appacleaned from time to time in the customary ratus shown in the drawings, it comprises a. manner. Valves 36 are disposed in the pipe mercerizing box or tank 10 mounted on the 34 on either side of the inlet pipe 35 to control floor 11 of the mercerizing room and containthe flow of Water to the top or bottom of the 95 ing the caustic soda solution in which the yarn filter. An overfiow box 37 is mounted in the or cloth is immersed; a filter 12 for clarifying upper portion of the filter-tank 14 to prevent the solution located below the Hoor; and a the sand being Washed away during the cleancooling device 13 located above the fioor and ing operation and at one end thereof it is prodisposed between the inlet and outlet ends of vided with a back wash overow pipe 38. 100

In operation, the contaminated caustic solution is Withdrawn continuously from the mercerizing box and circulated uninterruptedly through the filter and the cooler Where it is thoroughly purified and cooled to the proper temperature before returning to the mercerizing box. This method and apparatus insures a clarified and properly cooled solution of caustic soda at all times and renders the efficient production of mercerized cotton yarn and cloth of the highest quality. t

I claim as my invention 1. The method of treating a Inercerizing solution of caustic soda, which consists in withdrawing part of the solution from its container, purifying it by filtration and then circulating it through a cooling medium.

2. The method of treating a niercerizing solution of caustic soda, which consists in continuously withdrawing part of the solution from its container, purifying it by passing it through a filtering medium, then circulating it through a cooling medium to the required temperature, and finally returning it to the container.

VILLIAM H. EGGERT. 

